Question

Use StatKey or other technology to find the correlation for the following data.

X 12 18 24 30 36 42 48 54

Y 577 586 572 550 558 532 505 469

The correlation is r=

Answer 1

Solution:

	X	Y	XY	X2	Y2
	12	577	6924	144	332929
	18	586	10548	324	343396
	24	572	13728	576	327184
	30	550	16500	900	302500
	36	558	20088	1296	311364
	42	532	22344	1764	283024
	48	505	24240	2304	255025
	54	469	25326	2916	219961
SUM	264	4349	139698	10224	2375383

The correlation r is given by

Putting values we get ,

r = -0.92979

The correlation is r = -0.92979